Our Waterkeepers are experts on their local waterways. They monitor water quality in several different ways. Some are indirect by reviewing pollution reports required under Clean Water Act permits or analyzing government sponsored data collection. Waterkeepers also monitor water quality directly by conducting robust water sampling and then analyze and report their results in annual report card reports, interactive maps and mobile apps.

Blue Water Baltimore measures and maps water quality on the Patapsco and its tributaries and posts it on its interactive Baltimore Harber Water Alert map. The South River Federation rolled out an interactive data map in 2018. It takes a look at whether the river is fishable and swimmable and includes historical data. The data map also provides photos and information about where restoration projects are located. View the data map at www.southriverdata.net. James Riverkeeper also has an interactive map on current James River water quality at http://jamesriverwatch.org.